The Verge published a video demonstrating how desktop mode and Office 2013 - a desktop application - work on Windows RT, the ARM version of Windows 8. The video showed a desktop mode that clearly didn't work well for touch, and even Office 2013, which has a rudimentary touch mode built-in, didn't work properly either. It looked and felt clunky, often didn't respond properly, and even showed touch lag.

OK so touch may not work really well in desktop mode BUT I for one want full office even if it means using a keyboard and mouse when I use it. In fact i couldn't imagine writing a long document on a tablet without a keyboard.
Lots of people seem to agree because you just have to look at the popularity of VNC / RDP type apps on iOS and Android and also the number of BT keyboards being sold.